光伏系统的新型孤岛检测方法研究

Research on the New Island Detection Method of Photovoltaic System

针对传统主动频率偏移法通过逆变器注入畸变的扰动电流检测孤岛效应,产生了较大的谐波畸变、容性负载下检测速度慢甚至超出规定的检测时间导致检测失败等问题,提出了一种通过改变相位使基波分量发生必要偏移的新型电流扰动式孤岛检测方法。与传统主动频率偏移法相比,该方法检测速度更快,总谐波畸变率更小。通过Matlab建模仿真验证了该方法的可行性和优越性。

Aiming at the problem that the traditional active frequency drift method detects the islanding effect through the disturbance current of the inverter injection distortion,the total harmonic distortion rate is large,the detection speed is slow under capacitive load and even exceeds the prescribed detection time,which leads to the detection failure,a novel current disturbance islanding detection method was proposed,which can shift the fundamental component by changing the phase.Compared with the traditional active frequency drift method,the detection speed is faster than that of the traditional active frequency drift method.The simulation results of Matlab show the feasibility and superiority of this method.